
#two{
	clear:both;
	width:600px; 
	height:500px; 
	background:blue;
}
#two_1{
	
	clear:both;
	width:200px; 
	height:100px; 
	background:green;
}
#two_2{
	
	clear:both;
	width:400px; 
	height:300px; 
	background:gray;
}